Perhaps you should try some spelling variations:
scale studenten » scale student, schuler studenten, alte studenten
studenten die » studenten der, studenten des, studenten und
die filosofia » di filosofia, de filosofia, e filosofia
de literatur » de literatura, de literatuur, de litterature
tests scale » tests stable, sets scale, tests safe

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "tests scale studenten die filosofia ((e literatur) OR (de literatur))".
• Adding a wildcard symbol may retrieve word variants: tests scale studenten die filosofia ((e literatur) OR (de literatur))*.